Worksheet 723 · Skill 5

Set and drift

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1. At 1005 your fix is 072°T, 3.1 nm from Westfield church spire. You steer 068°T at 6.0 kn through the water. At 1045 a new fix puts you 327°T, 2.7 nm from Tern Island tower.

   Plot the 1045 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1020 your fix is 321°T, 1.4 nm from Tern Island tower. You steer 246°T at 4.1 kn through the water. At 1140 a new fix puts you 046°T, 3.0 nm from Heron Point Light.

   Plot the 1140 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0800 your fix is 256°T, 3.1 nm from Tern Island tower. You steer 178°T at 4.1 kn through the water. At 0855 a new fix puts you 342°T, 2.2 nm from Mill stack.

   Plot the 0855 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1320 your fix is 055°T, 2.8 nm from Westfield church spire. You steer 159°T at 4.2 kn through the water. At 1410 a new fix puts you 222°T, 3.4 nm from Tern Island tower.

   Plot the 1410 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1420 your fix is 105°T, 2.0 nm from Tern Island tower. You steer 107°T at 4.2 kn through the water. At 1455 a new fix puts you 080°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1455 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 284°T, 3.5 nm from Tern Island tower. You steer 140°T at 4.5 kn through the water. At 0800 a new fix puts you 244°T, 2.5 nm from Tern Island tower.

   Plot the 0800 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1230 your fix is 285°T, 3.0 nm from Tern Island tower. You steer 182°T at 6.2 kn through the water. At 1325 a new fix puts you 044°T, 2.4 nm from Heron Point Light.

   Plot the 1325 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1105 your fix is 349°T, 1.7 nm from Mill stack. You steer 076°T at 8.8 kn through the water. At 1140 a new fix puts you 339°T, 2.6 nm from Kittle water tank.

   Plot the 1140 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn